update BaseInterfaces README

BaseInterfaces/README.md

@@ -13,23 +13,26 @@ Currently this includes:
 - `AbstractArray` interface: `ArrayInterface`
 - `AbstractSet` interface: `SetInterface`
 - `AbstractDict` interface: `DictInterface`
+- `AbstractString` interface: `StringInterface`
 
+None of these should be considered either complete or authoritative,
+but they may be helpful in testing your objects basically conform.
+Please make issues and PRs with missing behaviours if you find them.
 
-Testing your object follows the interfaces is as simple as:
+Declaring that it follows the interface is done with:
 
 ```julia
-using BaseInterfaces, Interfaces
-Interfaces.tests(DictInterface, MyDict, [mydict1, mydict2, ...])
+@implements DictInterface{(:component1, :component2)} MyDict [MyDict(some_values...), MyDict(other_values...)]
 ```
 
-Declaring that it follows the interface is done with:
+Optional components can be chosen from `Interfaces.optional_keys(DictInterface)`.
+
+After this you can easily test it with:
 
 ```julia
-@implements DictInterface{(:component1, :component2)} MyDict
+Interfaces.test(DictInterface, MyDict)
 ```
 
-Where components can be chosen from `Interfaces.optional_keys(DictInterface)`.
-
 See [the docs](https://rafaqz.github.io/Interfaces.jl/stable/) for use.
 
 If you want to add more Base julia interfaces here, or think the existing